MGS-550 Fixed Gas Detector4 P/N: 1100-1000 Version 15.2 Making Adjustments to Sensors .............................................................................................. 365.2.1 Introduction ................................................................................................................. 365.2.2 General Procedure ..................................................................................................... 375.2.3 Zero Adjustment ......................................................................................................... 385.2.4 Span Adjustment ........................................................................................................ 385.2.5 System Bump Test ..................................................................................................... 385.3 Troubleshooting ....................................................................................................................... 395.3.1 Hexadecimal Format .................................................................................................. 395.3.2 Diagnostics Attributes ................................................................................................. 395.3.3 Instrument Electronics Critical (E100) Faults ............................................................. 405.3.4 Non-Critical (E300) Faults .......................................................................................... 415.3.5 Sensor Faults ............................................................................................................. 425.4 Sensor Maintenance (General Purpose Housings) ................................................................. 445.4.1 Components Overview ............................................................................................... 445.4.2 Replacing the Sensor Module .................................................................................... 455.4.3 Replacing the Sensor Control Board .......................................................................... 465.4.4 Replacing the Local Sensing Head Assembly............................................................ 475.4.5 Adding a Second Sensor ............................................................................................ 485.4.6 Replacing the Remote Sensing Head Assembly ....................................................... 495.5 Sensor Maintenance (Explosion Proof Housings) ................................................................... 505.5.1 Components Overview ............................................................................................... 505.5.2 Replacing the Sensor Module .................................................................................... 515.5.3 Replacing the Sensor Control Board .......................................................................... 525.5.4 Replacing the Local Sensing Head Assembly............................................................ 535.5.5 Replacing the Remote Sensing Head Assembly ....................................................... 545.6 Replacing the Instrument Electronics ...................................................................................... 555.7 Replacing the Interface Board ................................................................................................. 565.8 Cleaning the Instrument .......................................................................................................... 56SECTION 6. FACTORY DEFAULT SETTINGS .................................................................................. 57SECTION 7. SENSOR PRINCIPLE ..................................................................................................... 597.1 Electrochemical Sensors ......................................................................................................... 597.2 Catalytic Bead Sensors ........................................................................................................... 597.3 Semiconductor Sensors .......................................................................................................... 597.4 Infrared Sensors ...................................................................................................................... 60SECTION 8. DISPOSING OF THE INSTRUMENT ............................................................................. 618.1 Disposing of Electrical and Electronic Equipment ................................................................... 618.2 Disposing of Electrochemical Sensors .................................................................................... 61SECTION 9. TECHNICAL DATA......................................................................................................... 629.1 General Specifications ............................................................................................................. 629.2 Sensor Specifications .............................................................................................................. 639.3 Modbus Registers .................................................................................................................... 649.3.1 Analog Input Registers ............................................................................................... 659.3.2 Analog Output Registers ............................................................................................ 679.3.3 Input Status Flags ....................................................................................................... 699.3.4 Output Status Flags .................................................................................................... 70SECTION 10. ORDERING INFORMATION .......................................................................................... 7210.1 MGS-550 Instrument Only ....................................................................................................... 7210.2 MGS-550 Gas Detector, IP66 with IP66 Sensor ..................................................................... 7210.3 MGS-550 Ex d Instruments with Sensing Heads .................................................................... 7410.4 MGS-550 Gas Detector, Ex d Enclosure with Ex d Sensing Head ......................................... 7410.5 MGS-550 5m Remote and Second Sensing Heads ................................................................ 7510.6 MGS-550 Replacement Parts and Accessories ...................................................................... 78SECTION 11. DECLARATION OF CONFORMITY ............................................................................... 79www. .com information@itm.com1.800.561.8187